Javascript validation for wildcard in string

[gayuvinu]

Hi,
I am new to javascript, I need your help in javascript validation of a string.
string of length 6,
last 4 characters can be padded with "8" while entering.
valid strings are
ZJJL74
ZJJL7*
ZJJL**
ZJJ***
ZJ****

Invalid strings are
ZJ*L74
ZJJ*7*
*JJL**
Z*****
*****4
this means * cannot be entered in the middle,
it can be entered only at the end maximum up to last 4 characters.
please provide the solution ASAP, will be very grateful

[RamananKalirajan]

try using indexOf() function that will give you the solution what you are looking for...

Thanks and Regards
Ramanan Kalirajan

[gayuvinu]

can you please give the function with an example

[Dormilich]

why is everyone always wanting the code?

you could also try an RegExp. (you’ll probably need the look-ahead and/or look-before groups (?=, ?!, ?<=, ?<!))